The advantages of the extrusion blow molding

Molding Machine are those which are used to make shapes out of materials such as plastic, rubber and metal. There are a lot of different techniques for molding materials. The Stretch Blow Molding Machine techniques used is thermoses and thermoplastics and these change the nature of the plastic that has been processed through these techniques. Thermo sets make the plastic retain the shape that it has been molded in. Once you try to change it, you will have to melt it and in this process, this plastic will burn and become useless. The molded thermoplastics are made in small pieces that make their transportation easier and then melted together to make a pool out of it after which it can be given the shape of anything that the manufacturer wants to produce.

1)The cost of the extrusion blow molding machine is cheaper than that of injection molding machine, about one third of the injection blow molding machine.

2)On blowing molding, the preform is formed under low pressure through the extrusion equipment heat, in this circumstance, the residual stress of the products is small. With its good performance in tensile, impact, bending and other variety of environments, It have the good function.

3)In the injection blow molding, the plastic melt at high pressure (15–140Mpa) through the mold runner and gate, which will lead to uneven stress distribution.

4)The moleculars of blowing mold grade plastics(e.g,PE)are more than that of injection mold.
Such blow molding products have a high impact toughness and high resistance to environmental stress cracking performance, which is very favorable for the large-capacity production of plastic bottles.

5)The wall thickness of the blow molding products can be very thin while the injection molding products cannot be so thin as blowing mold process.

6)Blow molding process can shape complex and irregular products, but the injection molding process has to produce two or more pieces, and then stick it by the glue or bond it or using ultrasonic welding.

Source:https://www.sukoptfe.com/the-advantages-of-the-extrusion-blow-molding